Re: [PATCH] O_STREAMING - flag for optimal streaming I/O

From: J.A. Magallon (
Date: Tue Oct 08 2002 - 05:42:44 EST


On 2002.10.08 Robert Love wrote:
>Attached patch implements an O_STREAMING file I/O flag which enables
>manual drop-behind of pages.
>If the file has O_STREAMING set then the user has explicitly said "this
>is streaming data, I know I will not revisit this, do not cache
>anything". So we drop pages from the pagecache before our current
>index. We have to fiddle a bit to get writes working since we do
>write-behind but the logic is there and it works.

Sorry if this is a newbie question, but, does glibc pass flags blindly
to the syscal ?? Ie, I do not need to rebuild glibc to use this in
open(), fcntl() and so on, just I can make sure that bit 04000000
is set in the flags.


J.A. Magallon <>      \                 Software is like sex:                         \           It's better when it's free
Mandrake Linux release 9.0 (dolphin) for i586
Linux 2.4.20-pre9-jam1 (gcc 3.2 (Mandrake Linux 9.0 3.2-1mdk))
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